Cylinder lock assembly tool



Nov. 16, 1954 H. SELDITCH 2,694,325

CYLINDER LOCK ASSEMBLY T OOL Filed Nov. 10, 1955 INVENTOR HRRRY SELDITCHATTORNEY United States Patent CYLINDER "LOCK ASSEMBLY TOOL HarrySelditch, Philad elplliafla.

Application November 10, 1953, Serial No. 391,'196

2 Claims. '.(Gl.'-81-'5.1)

This invention relates .generally to'means-for inserting pins intobodies provided with' pin receiving openings and more particularly isconcerned'with an improved tool for handling during assembly the pins ofa cylinder lock.

A principal object of the present invention is to incorporate in a toolfor inserting the pins into the pin receiving bores in the cylinder of acylinder lock, means for urging a pin into its pin receiving boresimultaneously as the hold of the tool on the pin is relaxed.

Another object of the present invention is to provide such a tool withmeans for supporting and guiding a pin after the hold of the tool on thepin is relaxed.

Other objects and advantages of the present invention will appear morefully hereinafter, it being understood that the present inventionconsists substantially in the combination, construction, location andgeneral arrangement of parts, all as described in detail in thefollowing specification, as shown in the accompanying drawing and asfully pointed out in the appended claims.

in the accompanying drawings:

Figure 1 is a perspective view showing in use a tool embodying thepresent invention;

Figure 2 is a plan view of the tool shown in Figure 1;

Figure 3 is a side view of the tool holding a pin;

Figure 4 is an enlarged vertical section taken on line 4-4 of Figure 2;

Figure 5 is the same as Figure 4 but shows the tool about to bewithdrawn after its hold on the pin has been relaxed;

Figure 6 is an enlarged bottom view taken on the line 6-6 of Figure 2;and

Figure 7 is the same as Figure 6 but omits the pin and shows the jaws ofthe tool opened.

Referring to the drawings, a tool embodying the present invention maycomprise essentially a pair of pliers including sections pivotallysecured together as at 10 and having respectively handle parts 11 and 12and respectively jaw parts 13 and 14. The jaws 13 and 14 are flatelongated parts disposed in coplanar relation, and the correspondingterminal portions thereof are provided respectively with a pair ofgrooves 15-15 which when the jaw parts 13 and 14 are closed conjointlyform a vertically extending aperture adapted to receive a pin.

A leaf spring 16 is disposed in close overlying relation to the jawparts 13 and 14, one end portion of the leaf spring 16 being suitablyanchored to the jaw part 13 as by welding at 17, and the opposite endportion thereof being freely disposed over the terminal portions of thejaws 13 and 14. The latter end portion of the leaf spring 16 fixedlymounts an elongated depending element 18 which projects freely into theaperture formed by the grooves 15-15.

In the assembly of a cylinder lock, using the tool of the presentinvention, the pins are inserted in the pin receiving bores in thecylinder by the following procedure. Referring particularly to Figure l,the cylinder 19 is held so that its axially extending plug opening 20 ispositioned horizontally and the communicating laterally extending pinreceiving bores 21 are positioned vertically, extending downwardly fromthe plug opening 20. Now referring particularly to Figures 4 and 6, apin 22 is placed between the terminal portions of the jaw parts 13 and14 of the tool of the present invention, the opposite sides of the pin22 being seated respectively in the grooves 15-15. The pin 22 isadditionally positioned so that its upper end abuts the lower end ice ofthe element '18 and so that the leaf spring 16 is flexed, the lowerterminalportion of the pin 22 being disposed 'below the undersurface ofthe jaws 13 and 14. Referring particularly to Figure 1, with the pin 22firmly held as'described,-the jaw parts 13 and 14 are projected as showninto the plug opening 20, and the pin 22'is=-held'over'its pin receivingbore 21, the latter already having been fitted with a coil spring 23.The pin 22 is now moved about until the lower terminal portion thereofis in registry with the pin receiving bore 21 whereupon the pin--22-isreleased by the operator merely relaxing his grip onthe handle parts 11and 21. The energy previously stored in the leaf spring 16 beingreleased, the leaf spring 16 returns to its normal unflexed positioncloselyioverlying the jaws 13 and 14, as a consequence of which the leafspring 16 through the medium-of the element18 exerts a downward forceupon the pin 22, whereupon the latter moves downwardly into its pinreceiving bore 21.

It will be noted that the downward force aforementioned is exerted uponthe pin 22 simultaneously as the operators grip on the handles 11 and 12is relaxed, without any other movement of the tool, and additionallythat the aperture formed by the grooves 15-15 alfords a way forsupporting and guiding the pin 22 in its axial movement downwardly intoits pin receiving bore 21. Subsequently, the tool may be applied to thetop of the pin 22 and the latter pushed downwardly against the force ofthe coil spring 23 a distance sufficient to permit insertion of a dowelor similar device 24 into the plug opening 20 to a position over the pin22 for maintaining the same fully projected into its pin receiving bore21 while the remaining pins are handled successively in a similarmanner.

As the several pins 22 are successively fitted into their respectivebores 21, the dowel 24 is advanced axially into the plug opening 20until all of the seated pins are covered by the dowel, following whichthe dowel is replaced by the rotatable plug (not shown) of the lockassembly, which plug is conventionally fitted with springpressed pinsand is longitudinally slotted to receive the plug-actuating key.

In the assembly of a cylinder lock without the tool of the presentinvention, the pins are inserted in the pin receiving bores in thecylinder in accordance with the following more or less conventionalprocedure. The cylinder, free of its rotatable plug, is held asdescribed hereinabove. The pin to be inserted is then picked up withtweezers and inserted into the plug opening, being held over the pinreceiving bore in a vertical position with the lower end portion of thepin projecting below the tweezers. While thus held, the pin is movedabout until the lower end portion thereof is in registry with the pinreceiving bore, whereupon the pin is released and then pushed into thepin receiving bore by suitably applying the tweezers to the top of thepin. From the movement when the hold of the tweezers on the sides of thepin is relaxed until the tweezers are applied to the top of the pin asaforementioned, the pin is unsupported and unguided, as a consequence ofwhich it often happens that a pin moves out of registry with its pinreceiving here before it can be pushed into the same, making itnecessary to start all over again. For this reason, the use of tweezersor other ordinary tools has not proved to be entirely satisfactory.

It will be understood, of course, that the tool as hereinabove shown anddescribed is susceptible of various changes and modifications which maybe made from time to time without any departure from the generalprinciples or real spirit of the present invention. The jaw partsdescribed hereinabove might be, for example, the legs of the generallyU-shaped resilient member.

Furthermore, the leaf spring might be replaced by a suitably arrangedcoil spring. Accordingly, it is intended to claim the present inventionbroadly, as well as specifically, as indicated in the appended claims.

What is claimed as new and useful is:

1. A tool comprising a pair of flat elongated jaw parts secured togetherfor coplanar pivotal movement and having corresponding end portionsprovided respectively with a pair of grooves which conjointly form anaperture adapted to receive a pin, said jaws being thus adapted forreleasably holding the latter with its longitudinal axis extendinglaterally of the jaws, and yieldable means including a leaf springoverlying said jaws and anchored to one of the latter, the free endportion of said leaf spring being adapted for engagement with one endportion of the pin, and said leaf spring being adapted for storingenergy when the pin is held as aforesaid and releasing the energysimultaneously as the hold of said jaws on the pin is relaxed, said leafspring being operative upon release of the stored energy to move the pinaxially, and said grooved corresponding end portions of the jaws beingadapted to support and guide the pin during its axial movement.

2. A tool comprising a pair of flat elongated jaw parts secured togetherfor coplanar pivotal movement and having corresponding end portionsprovided respectively with a pair of grooves which conjointly form anaperture adapted to receive a pin, said jaws being thus adapted forreleasably holding the latter with its longitudinal axis extendinglaterally of the jaws, and yieldable means including a leaf springoverlying said jaws and anchored to one of the latter, and an elongatedelement extending laterally from the free end portion of said leafspring and freely into said aperture, said element being adapted forengagement with one end portion of the pin, and said leaf spring beingadapted for storing energy when the pin is held as aforesaid andreleasing the energy simultaneously as the hold of said jaws on the pinis relaxed, said leaf spring being operative upon release of the storedenergy to move the pin axially, and said grooved corresponding endportions of the jaws being adapted to support and guide the pin duringits axial movement.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 481,936 Eckert Sept. 6, 1892 1,753,080 Zwilling Apr. 1, 19301,802,666 Mueller Apr. 28, 1931

